Now showing items 1-3 of 3

    • A hole modulator for InGaN/GaN light-emitting diodes 

      Zhang, Z-H.; Kyaw, Z.; Liu W.; Ji Y.; Wang, L.; Tan S.T.; Sun, X. W.; Demir, Hilmi Volkan (American Institute of Physics, 2015)
      The low p-type doping efficiency of the p-GaN layer has severely limited the performance of InGaN/GaN light-emitting diodes (LEDs) due to the ineffective hole injection into the InGaN/GaN multiple quantum well (MQW) active ...
    • Lumped element modeling of CMUT arrays in collapsed mode 

      Aydoğdu, Elif; Özgürlük, A.; Atalar, Abdullah; Köymen, Hayrettin (IEEE, 2014-09)
      This study focuses on modeling collapsed modeoperation of CMUT arrays, and obtaining a small signal lumped element model for collapsed mode operation. Having the large signal model for single CMUT from previous studies, ...
    • Resonances and nonuniformities in CMUT elements or arrays 

      Atalar, Abdullah; Köymen, Hayrettin (IEEE, 2014-09)
      We determine the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances. Using a numerically efficient technique, we are able to ...